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In Reply to: RE: 8" versus 10" versus 12" versus 15" posted by Kingshead on May 03, 2017 at 19:52:22
Actually, a 12-inch speaker is really a 9-inch speaker for the purposes of moving air because the diameter of the moving diaphragm is only 9-inches. Therefore, measuring to the outside of a speakers basket might be good for designating speaker size, but it is not the correct measurement to use for calculating SPL. That's all I'm saying.
Consequently, I would need to see the algorithm in the SPL calculator in order to understand how it works and which speaker size designation to use.
Best regards,
John Elison
Follow Ups:
What you're looking for is the Effective piston area.
AFAIK you are correct, this does not include the surround. Only the cone itself.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
ok after looking at the calculator I see why you're confused, it would seem you're meant to measure the actual cone diameter, but is that to include the surround?But without knowing it's Xmax it's useless anyway, and if you have that info more than likely you also have the manufacturers measured max SPL as well. Even with all the sites required info plugged in it's still only a very rough estimate without all of the cones parameters (surface area, contour, etc) taken into account.
Martin
Edits: 05/04/17 05/04/17 05/04/17
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